Data from: The evolutionary puzzle of egg size, oxygenation and parental care in aquatic environments

Ines Braga Goncalves, Ingrid Ahnesjö & Charlotta Kvarnemo
Offspring fitness generally improves with increasing egg size. Yet, eggs of most aquatic organisms are small. A common but largely untested assumption is that larger embryos require more oxygen than they can acquire through diffusion via the egg surface, constraining egg size evolution. However, we found no detrimental effects of large egg size on embryo growth and survival under hypoxic conditions. We tested this in the broad-nosed pipefish, Syngnathus typhle, whose males provide extensive care...
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